Air purifier



FIG. 1 is a top, front perspective view of an air purifier showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a left side elevational view thereof; and,

FIG. 8 is a top, front cross-sectional view thereof, wherein the interior components, including concentric charged collection plates, blower and other parts, are shown in broken lines for illustrative purposes only and do not constitute a part of the claimed design. 

The ornamental design for an air purifier, as shown and described. 